采用高压固结仪与真三轴试验仪对广州原状粉质粘土分别进行固结压缩试验与固结不排水条件下的真三轴剪切试验,根据试验结果绘制其剪胀d与应力比η的关系曲线,探讨结构性土体的剪胀随中主应力系数bσ与大主应力与沉积方向夹角α的不同而呈现出来的变化趋势。试验结果表明:随着中主应力系数bσ与大主应力与沉积方向夹角α的增大,结构性土体的剪胀趋势越来越弱,且土体达到破坏时的应力比η随夹角α的变化而逐渐减小。说明结构性土体的初始各向异性与诱发各向异性共同影响着其剪胀特性与其强度的发挥。 The true triaxial shear tests of Guangzhou undisturbed silty clay were carried out by using the high pressure consolidation instrument and the true triaxial tester respectively. According to the test results, the dilatancy d and the stress ratio η The relationship between the dilatancy of structural soil and the main stress factor bσ and the difference between the principal stress and the sedimentary direction angle α is discussed. The experimental results show that the dilatancy tendency of structural soil becomes weaker and weaker with the increase of the angle α between the principal principal stress and sedimentary direction, Angle α changes and gradually decreases. It shows that the initial anisotropy and induced anisotropy of structural soil affect the dilatancy characteristics and the strength of the soil.